Strain Sensing With Parallel Air-cavity Fabry-Perot Interferometers Based On Vernier Effect

Abstract

We proposed and investigated Vernier Effect (VE) based strain sensor, which comprises two parallel air cavity Fabry-Perot Interferometers (FPI). The sensor involves simple fabrication techniques, such as cleaving and fusion splicing. A small section of Double Side Hole Fiber (DSHF) is cleaved and spliced between two pieces of Single Mode Fiber (SMF). The core of the SMF-1 and the air core of the DSHF are aligned by a minor lateral offset to make an air cavity FPI. During the strain measurement, the sensor exhibits the strain sensitivity of 36.7 pm/με. The sensor improves the sensitivity with the highest amplification factor of 10. In addition, the proposed strain sensor shows the temperature sensitivity of only 1 pm/°C in the temperature range of 30 °C–100 °C, which has temperature cross-sensitivity of 2.72 x 10−2 με/°C, and appear to be insensitive to temperature. The proposed device has high strain sensitivity, low temperature cross-sensitivity, simple fabrication, and low cost. Therefore, it has many applications in different engineering fields, for example, structural health monitoring and civil engineering.

Department(s)

Electrical and Computer Engineering

Keywords and Phrases

Fabry-Perot Interferometer; Strain Sensor; Vernier Effect

International Standard Serial Number (ISSN)

1068-5200

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2023 Elsevier, All rights reserved.

Publication Date

01 Dec 2022

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